664813874 has 16 divisors (see below), whose sum is σ = 1017551808. Its totient is φ = 325648752.

The previous prime is 664813871. The next prime is 664813901. The reversal of 664813874 is 478318466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (664813871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72749 + ... + 81375.

It is an arithmetic number, because the mean of its divisors is an integer number (63596988).

Almost surely, 2^664813874 is an apocalyptic number.

664813874 is a deficient number, since it is larger than the sum of its proper divisors (352737934).

664813874 is a wasteful number, since it uses less digits than its factorization.

664813874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9409.

The product of its digits is 774144, while the sum is 47.

The square root of 664813874 is about 25783.9848355525. The cubic root of 664813874 is about 872.7704321216.

The spelling of 664813874 in words is "six hundred sixty-four million, eight hundred thirteen thousand, eight hundred seventy-four".